In what way is The Coroner's Toolkit using postfix vulnerabilities?
The only relationship those two project has is that they share the same developer. COFEE however exploit microsoft own products.
It seems you are arguing that trust is not effected if companies first sells a product, then sells exploits for that product in secret. It may be small, or unimportant, or old product, but it doesn't really matter to me. Trust is not something that should be given out lightly.